方法1：
【使用spring自带BeanUtils实现克隆】
【要求：需要被克隆的类实现Cloneable接口并且重写clone()方法】
》例子：
》》实体：
package com.agen.orderdiscount.entity;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import lombok.experimental.Accessors;import org.hibernate.annotations.GenericGenerator;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import java.util.Date;/** * 预估金额 * 订单创建成功 往预估金额表中存入记录 * @author SXD * @date 2018/1/16 */@Data(staticConstructor = "of")@NoArgsConstructor@AllArgsConstructor@Accessors(chain = true)@Entity@GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator" )public class EsAmount implements Cloneable{ /** * 预估ID */ @Id @GeneratedValue(generator = "uuid2") @Column(length = 36) private String Id; /** * 本次转入预估金额 */ @Column(nullable = false,precision = 10,scale = 2) private Double esAccount; /** * 本次转入时间 */ @Column(nullable = false) private Date esDate; /** * 订单ID */ @Column(nullable = false) private Integer orderId; /** * 订单编号SN */ @Column(nullable = false,length = 20) private String orderSn; /** * 机构ID */ @Column(nullable = false) private Integer adminId; /** * 产品ID */ @Column(nullable = false) private Integer productId; /** * 会员ID */ @Column(nullable = false) private Integer memberId; /** * 采样包ID */ @Column(nullable = false) private Integer cybId; /** * 操作来源 */ @Column(nullable = false,length = 20) private String esOperater; /** * 预估金额备注1 */ @Column(length = 500) private String esCre1; /** * 预估金额备注2 */ @Column(length = 500) private String esCre2; @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); }} 》》使用：
EsAmount esAmount = esAmountRepository.findEsAmountByAdminIdAndOrderIdAndProductId(adminId,orderId,productId); if(Objects.nonNull(esAmount)){ //1.1 将预估金额扣除到可提现金额的记录也记录到预估金额记录表中 EsAmount esAmount1 = new EsAmount(); BeanUtils.copyProperties(esAmount,esAmount1); if(Objects.nonNull(esAmount1)){ BeanUtils.copyProperties(esAmount,esAmount1); 将参数1克隆一份给参数2
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方法2：
【使用java.lang.Serializable实现深度克隆】
【要求，不需要类实现Cloneable，只需要它们实现java.lang.Serializable即可】
》工具类：
import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;public abstract class BeanUtil { @SuppressWarnings("unchecked") public static T cloneTo(T src) throws RuntimeException { ByteArrayOutputStream memoryBuffer = new ByteArrayOutputStream(); ObjectOutputStream out = null; ObjectInputStream in = null; T dist = null; try { out = new ObjectOutputStream(memoryBuffer); out.writeObject(src); out.flush(); in = new ObjectInputStream(new ByteArrayInputStream(memoryBuffer.toByteArray())); dist = (T) in.readObject(); } catch (Exception e) { throw new RuntimeException(e); } finally { if (out != null) try { out.close(); out = null; } catch (IOException e) { throw new RuntimeException(e); } if (in != null) try { in.close(); in = null; } catch (IOException e) { throw new RuntimeException(e); } } return dist; }} 》使用：
Administrator src = new Administrator(new User("Kent", "123456", new Date()), true); Administrator dist = BeanUtil.cloneTo(src);
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